Drill Collars.

 

We supply D C’s in R2 and R3. All our DC’s are of AISI 4145 H, 110K material.

 

DC’s are a thick-walled tubular piece machined from one solid bar.

 

DC’s are primarily used for weight applied to bit.

 

Spiral DC’s reduce wall contact area and reduce risk of differential sticking.

 

Dahl Oilfield Services offers optional slip and elevator recesses for improved handling and safety, we also offer DC’s with drill pipe configuration on box tool joint.

  

Diameter

Bore

Connection Type & Size

Length

Bending Strength Ratio

Weight

in

mm

in

mm

ft

m

lb/30 ft

kg/9.14 m

3-1/8

79.4

1-1/4

31.8

NC23

30

9.14

2.57:1

622

300

3-1/2

88.9

1-1/2

38.1

NC26

30 or 31

9.14 or 9.45

2.42:1

809

367

4-1/8

104.8

2

50.8

NC31

30 or 31

9.14 or 9.45

2.43:1

1,030

476

4-3/4

120.7

2

50.8

NC38

30 or 31

9.14 or 9.45

2.58:1

1,502

681

5

127.0

2-1/4

57.2

NC38

30 or 31

9.14 or 9.45

2.38:1

1,592

722

6

152.4

2-1/4

57.2

NC44

30 or 31

9.14 or 9.45

2.49:1

2,578

1,169

6

152.4

2-13/16

71.4

NC44

30 or 31

9.14 or 9.45

2.84:1

2,328

1,056

6-1/4

158.8

2-1/4

57.2

NC44

30 or 31

9.14 or 9.45

2.91:1

2,825

1,281

6-1/4

158.8

2-13/16

71.4

NC46

30 or 31

9.14 or 9.45

2.63:1

2,558

1,160

6-1/2

165.1

2-1/4

57.2

NC46

30 or 31

9.14 or 9.45

2.76:1

3,050

1,383

6-1/2

165.1

2-13/16

71.4

NC50

30 or 31

9.14 or 9.45

3.05:1

2,816

1,277

6-3/4

171.5

2-1/4

57.2

NC50

30 or 31

9.14 or 9.45

3.18:1

3,352

1,520

7

177.8

2-1/4

57.2

NC50

30 or 31

9.14 or 9.45

2.54:1

3,632

1,647

7

177.8

2-13/16

71.4

NC50

30 or 31

9.14 or 9.45

2.73:1

3,413

1,548

7-1/4

184.2

2-13/16

71.4

NC50

30 or 31

9.14 or 9.45

3.12:1

3,693

1,675

7-3/4

196.9

2-13/16

71.4

NC56

30 or 31

9.14 or 9.45

2.70:1

4,315

1,957

8

203.2

2-13/16

71.4

6-5/8 REG

30 or 31

9.14 or 9.45

3.02:1

4,657

2,112

8-1/4

209.6

2-13/16

71.4

6-5/8 REG

30 or 31

9.14 or 9.45

2.93:1

4,966

2,252

9

228.6

2-13/16

71.2

NC61

30 or 31

9.14 or 9.45

3.17:1

6,055

2,746

9-1/2

241.3

3

76.2

7-5/8 REG

30 or 31

9.14 or 9.45

2.81:1

6,705

3,041

9-3/4

247.7

3

76.2

NC70

30 or 31

9.14 or 9.45

2.57:1

7,109

3,224

 

  

 

 

 

 



Dahl Oilfield Services AS / Hammaren 9A, 4056 Tananger / tlf:+4751419000 / post@dahl-os.no